Ian Abercrombie, who played Mr. Pitt, really couldn't work out how to see that 3-D picture until the actual audience taping. He became so excited to finally see it that Larry David told him to calm down, they had a show to tape.
The 3D art Kramer (Michael Richards) has is actually a spaceship. It's traveling around Saturn with a satellite in the background.
George is still dating Lindsay (Jessica Hecht) from The Couch (1994) in this episode. This is a rare time one of George's girlfriends remained for more than one episode (with the exception of Susan, who played a major role in seasons 4 and 7).
It aired on November 3, 1994, during a special "Blackout Thursday" night on NBC, in which all shows in the Must See TV line-up, except this one, featured a fictional New York City blackout (e.g., Friends: The One with the Blackout (1994)).
Jerry's (Jerry Seinfeld) comment after seeing Mischa (Maurice Godin), "Those capes are really coming back," is a reference to Frank Costanza's lawyer in episode 6.45, The Chinese Woman (1994), who also wore a cape.